You're supposed to get +200 Power and I think some skill not sure exactly, you might need to redownload the game again. (Cuz I know some of y'all mfers be downloading it off external sites.)
If redownloading doesn't work go to the questions channel in the discord.
I'd advise also getting a save file just before the evolution and have it on your desktop for the redownload so u can easily evolve and see if your problem has fixed!